Stumped---Floppy Drive

BluesMagoos · 1st March 2008, 09:50 PM

I’m working on another floppy drive turntable motor. This one is the Jumbo 5.25 drive. I thought the motor would run on 5 volts like the 3.5 floppy. That didn’t work so I tried 12 volts, no go. If I use both voltages together it runs. Using two voltages really complicates a simple project.
I need a solution if there is one.
Thanks
BluesMagoos

EC8010 · 2nd March 2008, 05:35 PM

Measure how much current it draws from the 5V rail, then use a regulator from the 12V rail to make 5V. (You need the current measurement to decide whether the 5V regulator needs a heatsink.)

poynton · 2nd March 2008, 06:03 PM

As far as I recall, all 5.25" floppy drives used +5v and +12v rails.

I cannot remember seeing any with only +5v or +12v .

Andy
(owned a computer repair business for 9 years)

CBRworm · 4th March 2008, 09:27 PM

It seems to me that a lot of the old floppy drive motors were either stepper motors or servo controlled with a an external speed sensor on the flywheel.

BluesMagoos · 5th March 2008, 12:58 AM

The disk spin motors are 3 phase brushless (blm) 360/300 rpm. The read/write motors are steppers. Hard to find disk motor projects, stepper motor projects are many.
Dual voltage is the working answer. 12V plus 5V makes it happy.
Beware of bad bearings in these motors. About half of my motors have bad bearings and are not usable (noise). My good motors run my TT fine. I’ve ordered some new bearings.
Thanks for the replies on the dual voltage question.
TC
BluesMagoos

1st March 2008, 09:50 PM	#1
BluesMagoos diyAudio Member Join Date: Apr 2006 Location: seattle	Stumped---Floppy Drive I’m working on another floppy drive turntable motor. This one is the Jumbo 5.25 drive. I thought the motor would run on 5 volts like the 3.5 floppy. That didn’t work so I tried 12 volts, no go. If I use both voltages together it runs. Using two voltages really complicates a simple project. I need a solution if there is one. Thanks BluesMagoos

2nd March 2008, 05:35 PM	#2
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	Measure how much current it draws from the 5V rail, then use a regulator from the 12V rail to make 5V. (You need the current measurement to decide whether the 5V regulator needs a heatsink.) __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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2nd March 2008, 06:03 PM	#3
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	As far as I recall, all 5.25" floppy drives used +5v and +12v rails. I cannot remember seeing any with only +5v or +12v . Andy (owned a computer repair business for 9 years)

4th March 2008, 09:27 PM	#4
CBRworm diyAudio Member Join Date: Jan 2007 Location: S. Florida	It seems to me that a lot of the old floppy drive motors were either stepper motors or servo controlled with a an external speed sensor on the flywheel.

5th March 2008, 12:58 AM	#5
BluesMagoos diyAudio Member Join Date: Apr 2006 Location: seattle	The disk spin motors are 3 phase brushless (blm) 360/300 rpm. The read/write motors are steppers. Hard to find disk motor projects, stepper motor projects are many. Dual voltage is the working answer. 12V plus 5V makes it happy. Beware of bad bearings in these motors. About half of my motors have bad bearings and are not usable (noise). My good motors run my TT fine. I’ve ordered some new bearings. Thanks for the replies on the dual voltage question. TC BluesMagoos